Rowing exercise machine



FIG. 1 is a perspective view of the rowing exercise machine;

FIG. 2 is a right side elevational view of the rowing exercise machine;

FIG. 3 is a left side elevational view of the rowing exercise machine;

FIG. 4 is a front elevational view of the rowing exercise machine, the rear elevational view being a mirror image thereof;

FIG. 5 is a top plan view of the rowing exercise machine; and,

FIG. 6 is a bottom plan view of the rowing exercise machine.

Any broken lines shown in FIGS. 1-6 are included for the purpose of illustrating environmental elements only and form no part of the claimed design. 

CLAIM The ornamental design for a rowing exercise machine, as shown and described. 